197 results on '"Ahmet Erdem"'
Search Results
2. Personality Traits as the Predictors of Eudaimonic Well-Being in Undergraduates
- Author
-
Muhammet Fatih Alkan, Rukiye Şahin, and Ahmet Erdem
- Subjects
eudaimonic well-being ,personality traits ,stability ,plasticity ,kişilik özellikleri ,durağanlık ,esneklik ,ödomanik iyi-oluş ,Theory and practice of education ,LB5-3640 - Abstract
The new approach in positive psychology is growing rich with the acceptance of life in all aspects and with views on the optimal use of human potential; it is being shaped by a new perspective that can be accepted as a full explanation of not only positive emotion but also of sources and motives of positive emotion, and respect for human. One of the predictors of positive emotion is personality traits. Within this scope, this research aimed at exploring the relationship between personality and eudaimonic well-being. A total of 316 undergraduates participated in the study. The data were collected online through the Questionnaire for Eudaimonic Well-Being and The Big Five Inventory. The findings showed that stability involving agreeableness, conscientiousness, and neuroticism significantly affected undergraduates’ eudaimonic well-being. However, plasticity involving extraversion and openness had no significant effect.
- Published
- 2024
- Full Text
- View/download PDF
3. The factors affecting tourism mobile apps usage
- Author
-
Ferhat Seker, Gökhan Kadirhan, and Ahmet Erdem
- Subjects
tourism mobile applications ,user behaviour ,technological self-efficacy ,convenience ,time-saving ,financial advantage ,Recreation leadership. Administration of recreation services ,GV181.35-181.6 - Abstract
The purpose of this study is to determine the key factor affecting the behaviour of using tourism mobile apps. Contrary to previous studies, the present paper highlights the key factor by evaluating the perceived advantages and technological self-efficacy together. So as to evaluate overall measurement quality and test the hypothesized relationships, a two-step approach was applied. In the first step, confirmatory factor analysis (CFA) was employed to test the validity of the measurement scales. Then, the dataset was analysed using the PLS-SEM method to test the proposed hypotheses. Data were collected from 213 adult participants through an online survey. The study revealed that time-saving is a key determinant of tourism mobile apps usage with the highest beta coefficient (0.335, p
- Published
- 2023
4. Celebration of National Days in Ankara: Performative Forms of Publicity during the Early Republican Period
- Author
-
Ahmet Erdem Tozoğlu, Elif Kaymaz, and Öykü Su Sezen
- Subjects
early republican period ,national days ,public space ,places of celebration ,ankara ,Urbanization. City and country ,HT361-384 - Abstract
This article examines public performances of official national day celebrations in Ankara during the early period of the Republic. As studying only one actor within a single conceptual framework of national day celebrations would be insufficient to depict the complex nature of social practices, this study argues that national day celebrations inherently incorporate simultaneously and reciprocally performed layers within the public sphere. This study considers the celebration spaces, which are the physical theater of events, as being a part of a network of material and spiritual tools that are utilized to improve the celebration performance and increase the enjoyment of the audience, while also considering the socio-spatial codes that control the masses and the celebration of mise-en-scene. This article uses three intertwined themes: the mobilization of the masses; the promotion of technological development and technical exhibition; and the circulation of the founding images and narratives, to introduce and discuss public performance in Ankara. The study concludes by suggesting that the interaction of these themes with each other explains the consent culture, nation-building strategies, and performative forms of publicity, that occurred during national day performances of the early period of the Republic of Turkey.
- Published
- 2022
- Full Text
- View/download PDF
5. Serum LH level prior to progestin administration is significant on pregnancy and live birth in programmed frozen-thawed embryo transfer cycles
- Author
-
Ismail Guler, Erhan Demirdag, Munire F. C. Akdulum, Mert Polat, Ahmet Erdem, and Mehmet Erdem
- Subjects
frozen-thawed embryo transfer ,luteinizing hormone ,estrogen ,artificial endometrial preparation ,programmed cycle ,Diseases of the endocrine glands. Clinical endocrinology ,RC648-665 - Abstract
PurposeTo evaluate the impact of serum LH levels prior to progestin administration on the outcomes of programmed frozen-thawed embryo transfer (FET) cycles.MethodsRetrospective cohort study was conducted to compare the treatment outcomes between four groups based on the 25 percentiles of serum LH levels before progestin administration in 596 cycles of 518 patients undergoing artificial endometrial preparation protocols for FET. Primary outcome measures were ongoing and live birth rates. Secondary outcome measures were the pregnancy rates, clinical pregnancy rates, and pregnancy loss rates.ResultsThe trends in clinical pregnancy (CPR) and live birth rates (LBR) increased from the first to the fourth quartile (Q1 to Q4) of serum LH levels prior to progestin administration (37,0% to 48,3%, p = 0.042, and 22.6% to 39.5%, respectively, p = 0.003). Pregnancy loss rates (PLR) were higher in group Q1, although the difference was not statistically significant. Based on a multivariate logistic regression analysis, a low serum LH level before progestin initiation was found to be the most significant predictor associated with a negative effect on live birth (OR: 0,421, 95% CI 0,178 – 0,994, p=0,048). The day of estrogen initiation was significantly correlated with serum LH levels and quartiles of serum LH levels before progestin administration (r=0,200, p=0,015 and r=0,215, p=0,009, respectively).ConclusionThe serum LH level prior to progestin administration significantly affects pregnancy and live birth rates in patients undergoing an artificial endometrial preparation protocol for FET. LH monitoring should be incorporated into the follow-up, in addition to assessing endometrial thickness and morphology in artificial FET cycles.
- Published
- 2023
- Full Text
- View/download PDF
6. Aerogel‐Based Biomaterials for Biomedical Applications: From Fabrication Methods to Disease‐Targeting Applications
- Author
-
Solmaz Karamikamkar, Ezgi Pinar Yalcintas, Reihaneh Haghniaz, Natan Roberto deBarros, Marvin Mecwan, Rohollah Nasiri, Elham Davoodi, Fatemeh Nasrollahi, Ahmet Erdem, Heemin Kang, Junmin Lee, Yangzhi Zhu, Samad Ahadian, Vadim Jucaud, Hajar Maleki, Mehmet Remzi Dokmeci, Han‐Jun Kim, and Ali Khademhosseini
- Subjects
additive manufacturing ,aerogel ,diagnosis ,drug delivery ,microfluidics ,tissue engineering ,Science - Abstract
Abstract Aerogel‐based biomaterials are increasingly being considered for biomedical applications due to their unique properties such as high porosity, hierarchical porous network, and large specific pore surface area. Depending on the pore size of the aerogel, biological effects such as cell adhesion, fluid absorption, oxygen permeability, and metabolite exchange can be altered. Based on the diverse potential of aerogels in biomedical applications, this paper provides a comprehensive review of fabrication processes including sol‐gel, aging, drying, and self‐assembly along with the materials that can be used to form aerogels. In addition to the technology utilizing aerogel itself, it also provides insight into the applicability of aerogel based on additive manufacturing technology. To this end, how microfluidic‐based technologies and 3D printing can be combined with aerogel‐based materials for biomedical applications is discussed. Furthermore, previously reported examples of aerogels for regenerative medicine and biomedical applications are thoroughly reviewed. A wide range of applications with aerogels including wound healing, drug delivery, tissue engineering, and diagnostics are demonstrated. Finally, the prospects for aerogel‐based biomedical applications are presented. The understanding of the fabrication, modification, and applicability of aerogels through this study is expected to shed light on the biomedical utilization of aerogels.
- Published
- 2023
- Full Text
- View/download PDF
7. The Relationship Between Subclinical Hypothyroidism and Gestational Diabetes Mellitus
- Author
-
Seçil İrem Arık Alpçetin, Ahmet Erdem, Mehmet Erdem, Erhan Demirdağ, and Munire Funda Cevher Akdulum
- Subjects
gestasyonel diabetes mellitus ,hipotiroidizm ,gebelik ,gestational diabetes mellitus ,hypothyroidism ,pregnancy ,Medicine - Abstract
Aim: The most common metabolic disorder during pregnancy is gestational diabetes mellitus (GDM). GDM can occur in anywhere between 1.7 and 11.6 percent of people. In hypothyroidism, the rates of glucose oxidation and glycogen synthesis are reduced, and the peripheral tissues' consumption of glucose is also delayed. Patients with subclinical and overt hypothyroidism develop insulin resistance because insulin is unable to adequately maintain the muscles' use of glucose. According to the literature, hypothyroidism is linked to 6–15 percent of GDM pregnancies. Additionally, the chance of having GDM is 4.3 times higher in pregnant women who have hypothyroidism. This study aimed to reveal the relationship between first-trimester thyroid function tests and GDM. Material and Method: This retrospective cohort study was conducted between May 2021 and May 2022. 100 pregnant patients diagnosed with GDM and 500 healthy controls were included in the study. Using a 75 g glucose challenge test, GDM was identified. The trimester-specific recognized normal limits were used to evaluate the TSH and fT4 readings. Results: There was a statistically significant difference in terms of SCH between patients with and without GDM (p=0.04). TSH's performance in predicting GDM was evaluated using AUC and ROC (AUC=0.586 and p=0.006). To forecast GDM, the TSH level cut-off value was discovered to be 1.58. The AUC was found to be 0.586 (0.521-0.652). Furthermore, the selectivity is 58% and the sensitivity is 41% Conclusion: There are many studies in the literature investigating thyroid functions and the development of gestational diabetes mellitus. Our study also found a correlation between the diagnosis of subclinical hypothyroidism in the first trimester and GDM. The study adds to the literature the importance of being cautious and vigilant in terms of the development of gestational diabetes mellitus based on the results of the thyroid function test in the first trimester.
- Published
- 2022
- Full Text
- View/download PDF
8. Predicting Gestational Diabetes Mellitus Using The Systemic Immune-Inflammation Index in The First Trimester
- Author
-
Ahmet Erdem, Mehmet Erdem, Safarova Sahila, Munire Funda Cevher Akdulum, and Erhan Demirdağ
- Subjects
systemic immune inflamation ,gestational diabetes mellitus ,pregnancy ,sistemik i̇mmun-i̇nflamasyon i̇ndeksi ,gestasyonel diyabetes mellitus ,gebelik ,Medicine - Abstract
Aims: Gestational diabetes mellitus (GDM) is an inflammatory disorder. GDM raises the risk of pregnancy complications. Early recognition of GDM is critical to prevent complications. Systemic Immune-Inflammation Index (SII) is an index that shows the inflammatory response, we hypothesized that it might be associated to GDM. The purpose of this study was to determine the relationship between GDM and SII, as well as whether SII in the first trimester can predict GDM. Material and Method: This retrospective cohort study was conducted between January 2021 and January 2022. 100 pregnant women were included in the study. The study group included 50 pregnant women who had been diagnosed with GDM. The control group consisted of the remaining 50 pregnant women who had not been diagnosed with GDM. SII values were calculated from the hemogram values of the patients at the first visit in the first trimester. Results: There was a statistically significant difference between GDM and control groups in terms of SII, platelet, neutrophil, fT3, apgar 1 min and apgar 5 min measurements (p
- Published
- 2022
- Full Text
- View/download PDF
9. The Mediating Role of Coping with Stress in Problematic Internet Use and Cognitive Flexibility Relation
- Author
-
Ahmet Erdem
- Subjects
problematic internet use ,cognitive flexibility ,coping with stress. ,problematic internet use, cognitive flexibility, coping with stress. ,Education (General) ,L7-991 - Abstract
Cognitive flexibility is a term encompassing three basic domains and meaning the ability to adjust individuals’ cognition depending on varying circumstances. Problematic internet use may be related to psychological structures. In addition, studies have shown that the internet is both a stress-making tool and a safe haven in which individuals can seek to cope with stress. Taken all together, the purpose of the study was to observe the mediating role of coping with stress in the relationship between problematic internet use and cognitive flexibility. Chosen by convenient sampling, the participants were 706 volunteered secondary school pupils from Turkey. All data were collected with Cognitive Flexibility Scale, Strategies for Coping with Stress Scale and Young Internet Addiction Test-Short Form. As the study results revealed, problematic internet use had a negative significant effect on cognitive flexibility without the inclusion of strategies for coping with stress. Accordingly, the prediction effect of problematic internet use on cognitive flexibility became non-significant after the inclusion of strategies for coping with stress.
- Published
- 2022
10. 'Fransız Oryantalizminde Hz. Muhammed İmajı' Kitap İncelemesi
- Author
-
Ahmet Erdem Işık
- Subjects
Islam ,BP1-253 - Abstract
Oryantalizmin teşekkül ettiği ya da daha doğru bir ifadeyle teşekkül etmesine büyük oranda katkısı bulunması hasebiyle Fransa’da ve Fransız oryantalistlerin telif etmiş olduğu eserlerdeki Hz. Muhammed (s.a.v.) algısı ve bu algının bir sonucu olarak peygamber imajının tarihsel boyutunu ortaya koymak, günümüzdeki ön yargı ve ithamların kaynağını bir nebze olsun tespit etmek önem arz etmektedir. Fransa’nın Batı dünyasının önemli bir kültür ve entelektüel merkezi olmasından, burada ortaya konulan yaklaşımların Batı’nın diğer yerlerinde de bir şekilde etkili olduğundan mütevellit böyle bir merkezde Hz. Muhammed (s.a.v.) üzerine eserler telif eden ve bu eylemlerini etik ve akademik temeller üzerine inşa etme çabasını göstermiş olan Maurice Gaudefroy-Demombynes, Régis Blachère ve Maxime Rodinson adlı müellifleri çalışmasına konu etmiş olan Dr. İsmail Metin, Prof. Dr. Seyfettin Erşahin danışmanlığında hazırlamış olduğu “Fransız Oryantalistlerin Siyer Literatüründe Hz. Muhammed İmajı: Maurice Gaudefroy-Demombynes, Régis Blachère ve Maxime Rodinson Örneği” isimli doktora tezinin yeniden gözden geçirmiş, düzenlemiş ve geliştirmiş hâlde, Fransız oryantalizminin başlıca isimlerinden Gaudefroy-Demombynes, Blachère ve Rodinson’un Hz. Muhammed (s.a.v.) ile ilgili görüş ve düşünceleri karşılıklı olarak ele almakta, olaylara yaklaşım tarzlarını tespit etmeye çalışmaktadır. Bu doğrultuda mevzubahis kitap literatürde edindiği yer ve doldurduğu boşluk açısından değerlendirilmiştir.
- Published
- 2022
- Full Text
- View/download PDF
11. Temporal motifs in patent opposition and collaboration networks
- Author
-
Penghang Liu, Naoki Masuda, Tomomi Kito, and Ahmet Erdem Sarıyüce
- Subjects
Medicine ,Science - Abstract
Abstract Patents are intellectual properties that reflect innovative activities of companies and organizations. The literature is rich with the studies that analyze the citations among the patents and the collaboration relations among companies that own the patents. However, the adversarial relations between the patent owners are not as well investigated. One proxy to model such relations is the patent opposition, which is a legal activity in which a company challenges the validity of a patent. Characterizing the patent oppositions, collaborations, and the interplay between them can help better understand the companies’ business strategies. Temporality matters in this context as the order and frequency of oppositions and collaborations characterize their interplay. In this study, we construct a two-layer temporal network to model the patent oppositions and collaborations among the companies. We utilize temporal motifs to analyze the oppositions and collaborations from structural and temporal perspectives. We first characterize the frequent motifs in patent oppositions and investigate how often the companies of different sizes attack other companies. We show that large companies tend to engage in opposition with multiple companies. Then we analyze the temporal interplay between collaborations and oppositions. We find that two adversarial companies are more likely to collaborate in the future than two collaborating companies oppose each other in the future.
- Published
- 2022
- Full Text
- View/download PDF
12. GENDER ROLES AND DATING VIOLENCE: A MEDIATOR ROLE OF MORAL DISENGAGEMENT
- Author
-
Ahmet Erdem and Fuad Bakioğlu
- Subjects
gender roles ,daring violence ,moral disengagement ,university students ,Education (General) ,L7-991 - Abstract
The aim of this study was to investigate the mediator role of moral disengagement in the relationship between gender roles and dating violence. Participants were 425 university students [310 (72.9%) female, 115 (27.1%) male, Mage = 20.68 years, SD = 2.21] who completed questionnaires package involving the Gender Roles Attitudes Scale, the Attitudes toward Dating Violence Scales, and the Moral Disengagement Scale. The data were analyzed using structural equation modeling. A bootstrapping analysis was conducted in order to determine any indirect effects. The results showed that gender roles predicted moral disengagement and dating violence negatively, and that moral disengagement predicted dating violence positively. It was further found that the structural equation model that proposed that gender roles had a direct and an indirect effect through moral disengagement on dating violence was confirmed. The results of the study were discussed in the light of relevant literature, and suggestions for future studies were made.
- Published
- 2020
- Full Text
- View/download PDF
13. [Untitled]
- Author
-
Ahmet Erdem and Meryem Özdemir
- Subjects
online counseling ,online therapy ,qualitative analysis ,Psychiatry ,RC435-571 - Abstract
With advancements in technology, proliferation of online counseling services has recently become observable. The purpose of the current study was to reveal what people know about face-to-face and online counseling and to determine the direction of their preferences for both. The participants of the current study, which is of a qualitative case study, were 25 people, ranging in age from 17 to 49, of different professions (soldiers, security officers, secretaries, drivers, officers, housekeepers, housewives, high school-university students and academicians). While 4 of the participants reported experiencing face-to-face counseling services, 21 participants did not report receiving one. Besides, none of the participants reported receiving online counseling services. The time that the participants want to allocate for online counseling services was found to be more than the time that they want to allocate for face-to-face counseling. The top two methods that 17 participants preferred, being of the opinion that they would have a warm ambiance while receiving counseling, were video conference (7), and chatting (5). Finally, it was also observed that most of the participants (20) preferred face-to-face counseling services due to the existence of active participation and non-verbal reactions such as gestures and facial expressions, and very few of them (5) preferred online counseling services because of anonymity and availability. Results in general showed that individuals were eager to receive online counseling and find it more useful in terms of finance and availability.
- Published
- 2020
- Full Text
- View/download PDF
14. The impact of the modified speculum application technique on the success rates of intrauterine insemination: A randomized controlled study
- Author
-
Ilknur Mutlu, Mehmet Erdem, and Ahmet Erdem
- Subjects
Gynecology and obstetrics ,RG1-991 - Abstract
Objective: Intrauterine insemination (IUI) is frequently used to treat patients with ovulation disorders, cervical factor, mild male infertility and unexplained infertility. The aim of this study was to investigate the impact of modified speculum application on the success of IUI in patients with unexplained infertility. Materials and methods: This prospective randomized study reviewed 219 women who had undergone controlled ovarian hyperstimulation (COH)-IUI treatment. In the modified speculum application group (109 patients with 124 cycles), the screw of the vaginal speculum was loosened after passing the internal os with catheter and the vaginal speculum remained in this position to ensure closure of the cervix during the procedure. In the conventional speculum application group (110 patients with 132 cycles), the screw of the vaginal speculum was not loosened to close the lips of cervix after passing the internal os with the catheter and the vaginal speculum was removed after withdrawal of the insemination catheter. The primary outcome was live birth rate. Results: The modified and conventional speculum application groups had statistically similar demographic and clinical characteristics. There were no significant differences between the study and the control groups in terms of the clinical pregnancy rate per cycle and per patient (24.1% vs 18.9% and 26.6% vs 22.7%, respectively), as well as the live birth rate per cycle and per patient (19.3% vs 15.1% and 22% vs 18.1% respectively). Conclusion: Applying gentle mechanical pressure on the portio vaginalis of the cervix using a vaginal speculum during IUI does not improve pregnancy and live birth rates in patients with unexplained infertility. Keywords: Intrauterine insemination, Controlled ovarian hyperstimulation, Speculum, Technique
- Published
- 2019
- Full Text
- View/download PDF
15. An Alkaline Based Method for Generating Crystalline, Strong, and Shape Memory Polyvinyl Alcohol Biomaterials
- Author
-
Mohammad Ali Darabi, Ali Khosrozadeh, Ying Wang, Nureddin Ashammakhi, Halima Alem, Ahmet Erdem, Qiang Chang, Kaige Xu, Yuqing Liu, Gaoxing Luo, Ali Khademhosseini, and Malcolm Xing
- Subjects
biomaterials ,catheters ,hydrogels ,injectable electronics ,microfluidics ,polyvinyl alcohol ,Science - Abstract
Abstract Strong, stretchable, and durable biomaterials with shape memory properties can be useful in different biomedical devices, tissue engineering, and soft robotics. However, it is challenging to combine these features. Semi‐crystalline polyvinyl alcohol (PVA) has been used to make hydrogels by conventional methods such as freeze–thaw and chemical crosslinking, but it is formidable to produce strong materials with adjustable properties. Herein, a method to induce crystallinity and produce physically crosslinked PVA hydrogels via applying high‐concentration sodium hydroxide into dense PVA polymer is introduced. Such a strategy enables the production of physically crosslinked PVA biomaterial with high mechanical properties, low water content, resistance to injury, and shape memory properties. It is also found that the developed PVA hydrogel can recover 90% of plastic deformation due to extension upon supplying water, providing a strong contraction force sufficiently to lift objects 1100 times more than their weight. Cytocompatibility, antifouling property, hemocompatibility, and biocompatibility are also demonstrated in vitro and in vivo. The fabrication methods of PVA‐based catheters, injectable electronics, and microfluidic devices are demonstrated. This gelation approach enables both layer‐by‐layer and 3D printing fabrications.
- Published
- 2020
- Full Text
- View/download PDF
16. Safety Considerations in 3D Bioprinting Using Mesenchymal Stromal Cells
- Author
-
Lucy Belk, Nazzar Tellisi, Hamish Macdonald, Ahmet Erdem, Nureddin Ashammakhi, and Ippokratis Pountos
- Subjects
mesenchymal stromal cells ,ex vivo expansion ,bioprinting ,additive manufacturing ,3D bioprinting ,Biotechnology ,TP248.13-248.65 - Abstract
Three-dimensional (3D) bioprinting has demonstrated great potential for the fabrication of biomimetic human tissues and complex graft materials. This technology utilizes bioinks composed of cellular elements placed within a biomaterial. Mesenchymal stromal cells (MSCs) are an attractive option for cell selection in 3D bioprinting. MSCs can be isolated from a variety of tissues, can pose vast proliferative capacity and can differentiate to multiple committed cell types. Despite their promising properties, the use of MSCs has been associated with several drawbacks. These concerns are related to the ex vivo manipulation throughout the process of 3D bioprinting. The herein manuscript aims to present the current evidence surrounding these events and propose ways to minimize the risks to the patients following widespread expansion of 3D bioprinting in the medical field.
- Published
- 2020
- Full Text
- View/download PDF
17. Elevated PAPP-A levels in lean patients with polycystic ovary syndrome
- Author
-
Merve Öztürk, Mesut Öktem, S. Özlem Altinkaya, Emel Özalp Öktem, Şehri Elbeg, Ahmet Erdem, and Mehmet Erdem
- Subjects
Polycystic ovary syndrome ,Pregnancy associated pregnancy protein-A ,Cardiovascular risk ,Gynecology and obstetrics ,RG1-991 - Abstract
Objectives: This study aimed to evaluate the serum concentrations of PAPP-A (pregnancy associated placental protein-A), a biomarker which is associated with cardiovascular disease, in patients with polycystic ovary syndrome (PCOS). Materials and Methods: A total of 62 women with PCOS, and 68 age and body mass index (BMI) matched controls were eligible for the study. Hirsutism scores, hormonal and metabolic profile as well as PAPP-A levels were assessed in each subject. Results: Women with PCOS and controls yielded similar median serum levels of PAPP-A (1.7 ng/ml versus 1.8 ng/ml, respectively, p = 0.328). However, when patients were compared based on BMI; subgroup analyses found that among women with BMI
- Published
- 2018
- Full Text
- View/download PDF
18. The effects of resveratrol on ovarian hyperstimulation syndrome in a rat model
- Author
-
Sebnem Ozgur, Mesut Oktem, S. Ozlem Altinkaya, Emel Ozalp Oktem, Cahit Cenksoy, Ozlem Erdem, Sehri Elbeg, Ayse Helvaci, Ahmet Erdem, and Mehmet Erdem
- Subjects
Ovarian hyperstimulation syndrome ,Resveratrol ,Rat model ,Gynecology and obstetrics ,RG1-991 - Abstract
Objective: The aim of the present study was to investigate effects of resveratrol (RSV) over ovarian hyperstimulation syndrome (OHSS) in rat model. Materials and Methods: 24 female Wistar rats (22 days old) were divided into four groups. Group 1 (control group; n = 6) received 0.1 ml intraperitoneal (IP) saline from days 22–26; group 2 (mild-stimulated group; n = 6) received 10 IU pregnant mare serum gonadotropin (PMSG) on day 24 and 10 IU of hCG 48 h later (day 26); group 3 (OHSS group; n = 6) was given 10 IU of PMSG for 4 consecutive days from day 22 and 30 IU hCG on the fifth day to induce OHSS; group 4 (OHSS + RSV group; n = 6) was treated the same as group 3, but received 60 mg/kg RSV 2 h before PMSG injection for 4 consecutive days and 2 h before the hCG injection on the fifth day. Results: Weight gain was highest in the OHSS group. Ovarian weights were lower in the treatment group than OHSS group. Peritoneal fluid VEGF levels were lower for RSV group compared to group 2 and 3. Total VEGF immunoreactivity was higher in OHSS group than group 1, 2 and 4. Conclusion: These results indicate that RSV is beneficial for prevention of OHSS by reducing the increases in body and ovarian weight and VEGF activity. These effects may be mediated by anti-inflammatory, anti-oxidant and anti-angiogenic capacity of RSV.
- Published
- 2018
- Full Text
- View/download PDF
19. Assessment of a Novel Fixation Method of a Frameless Intrauterine Contraceptive Device Inserted during Cesarean Delivery as a Means of Preventing Displacements and Expulsions: A Prospective Observational Study
- Author
-
Hazal Kutlucan, Recep Onur Karabacak, Stefanie De Buyser, Ahmet Erdem, Nuray Bozkurt, Erhan Demirdağ, and Dirk Wildemeersch
- Subjects
fixation ,cesarean section ,frameless intrauterine device ,anchoring ,immediate post-placental insertion ,postpartum contraception ,Science - Abstract
The primary objective of this study was to assess the novel fixation method of a frameless copper-releasing intrauterine device inserted following placental delivery during cesarean section and analyze its impact in reducing device displacement and expulsion during and after uterine involution. We hypothesized that the dual-anchoring technique could reduce the risk of intrauterine device displacement and expulsion during and after the uterine involution. The study was conducted at the Gazi University Medicine Faculty Hospital in Ankara, Turkey. Twenty-one pregnant women were enrolled. Insertion was performed following placental removal. To confirm the proper placement and good retention of the device, the distance between the fundal serosa (S) and device anchor knot (A) was measured (S–A) during follow-ups, by ultrasound. There were significant differences in the S–A, as observed by ultrasound at discharge and at 6 weeks post-delivery, which is consistent with the tissue contractions associated with uterine involution. Notwithstanding the uterine involution, no device displacements or expulsions occurred, which indicated a good retention of the frameless device. This innovative retention method of the frameless intrauterine device ensures a well-tolerated, long-term contraception, allowing for immediate contraception and proper pregnancy spacing for cesarean scar healing, and overcomes the issue of expulsion encountered with conventional intrauterine systems.
- Published
- 2022
- Full Text
- View/download PDF
20. Comparison of The Effectiveness of Clomiphene Citrate versus Letrozole in Mild IVF in Poor Prognosis Subfertile Women with Failed IVF Cycles
- Author
-
Mesut Oktem, Ismail Guler, Mehmet Erdem, Ahmet Erdem, Nuray Bozkurt, and Onur Karabacak
- Subjects
icsi ,ovarian response ,clomiphene citrate ,letrozole ,ovarian stimulation ,Medicine (General) ,R5-920 - Abstract
Background Our objective was to evaluate the effectiveness of clomiphene citrate (CC) vs. letrozole (L) plus human menopausal gonadotropin (hMG) in gonadotropin releasing hormone (GnRH) antagonist protocol in poor prognosis women with previous failed ovarian stimulation undergoing intracytoplasmic sperm injection (ICSI). Materials and Methods This retrospective cohort study included cycles with CC and L plus hMG/GnRH antagonist protocols of 32 poor responders who had failed to have ideal follicles to be retrieved during oocyte pick-up (OPU) or embryo transfer (ET) at least for 2 previous in vitro fertilization (IVF) cycles with microdose flare protocol or GnRH antagonist protocol from January 2006 to December 2009. Main outcome measures were implantation, clinical pregnancy and live birth rates per cycle. Duration of stimulation, mean gonadotropin dose used, endometrial thickness, number of mature follicles, serum estradiol (E2) and progesterone (P) levels on the day of human chorionic gonadotropin (hCG) administration, number of retrieved oocytes and fertilization rates were also evaluated. Results A total number of 42 cycles of 32 severe poor responders were evaluated. Total gonadotropin consumption was significantly lower (1491 ± 873 vs. 2808 ± 1581 IU, P=0.005) and mean E2 level on the day of hCG injection were significantly higher in CC group than L group (443.3 ± 255.2 vs. 255.4 ± 285.2 pg/mL, P=0.03). ET, overall pregnancy and live birth rates per cycle were significantly higher in CC than L protocol (27.2 vs. 15%, 13.6 vs. 0% and 4.5 vs. 0%, respectively, P < 0.05). Conclusion Severe poor responders who had previously failed to respond to microdose or GnRH antagonist protocols may benefit from CC plus hMG/GnRH antagonist protocol despite high cancellation rate.
- Published
- 2015
- Full Text
- View/download PDF
21. Effect of Pertubation on Pregnancy Rates before Intrauterine Insemination Treatment in Patients with Unexplained Infertility
- Author
-
Funda Yildiz, Nuray Bozkurt, Ahmet Erdem, Mehmet Erdem, Mesut Oktem, and Recep Onur Karabacak
- Subjects
pertubation ,gonadotrophin ,unexplained infertility ,Medicine (General) ,R5-920 - Abstract
Background: The aim of this study was to determine the relationship between marital violence and distress level among women with a diagnosis of infertility. Materials and Methods: In this prospective randomized study, a total of 180 patients were included in the study. Amongst these, pertubation of the uterine cavity was carried out in 79 patients prior to insemination. One patient in the pertubation group was later excluded because insemination could not be performed due to cycle cancellation. Results: There were no significant differences in demographic characteristics between the study and control groups. When the pregnancy rates of both groups were evaluated, 14(17.8%) patients in the study group achieved pregancy. Three (3.8%) had a biochemical pregnancy, 1(1.3%) miscarried and 10(12.7%) had live births. In the control group, a total of 24(23.8%) pregnancies were achieved, amongst which one (1%) had a biochemical pregnancy, 3(3%) miscarried and 20(19.8%) resulted in live births. There was no significant difference between groups in terms of total pregnancy and live birth rates (p > 0.05). There was a 21% total pregnancy loss rate. There was no significant difference between the control and study groups in terms of pregnancy loss rates (p > 0.05). Conclusion: This study on a homogenous group of unexplained infertile patients determined that the addition of pertubation to a controlled ovarian hyperstimulation plus intrauterine insemination (COH+IUI) treatment protocol did not affect pregnancy rates (Registration Number: NCT01999959).
- Published
- 2014
22. Polarization and Spectral Energy Distribution in OJ 287 during the 2016/17 Outbursts
- Author
-
Mauri Valtonen, Stanislaw Zola, Helen Jermak, Stefano Ciprini, Rene Hudec, Lankeswar Dey, Achamveedu Gopakumar, Daniel L. Reichart, Daniel B. Caton, Kosmas Gazeas, Katsura Matsumoto, Waldemar Ogloza, Marek Drozdz, Fahri Alicavus, Oleksandr Baransky, Andrei Berdyugin, Panos Boumis, Yurii Bufan, Bartlomiej Debski, Huseyin Er, Ahmet Erdem, Vira Godunova, Shirin Haque, Vivian L. Hoette, Jan Janik, Mark Kidger, Tomasz Kundera, Sebastian Kurowski, Alexis Liakos, Isa Mohammed, Kari Nilsson, Urszula Pajdosz, Vilppu Piirola, Tapio Pursimo, Brandon Rajkumar, Andrii O. Simon, Michal Siwak, Eda Sonbas, Ian A. Steele, Volodymir V. Vasylenko, Michal Zejmo, and Pawel Zielinski
- Subjects
galaxies: active ,BL lacertae objects: individual (OJ 287) ,super massive black holes ,Astronomy ,QB1-991 - Abstract
We report optical photometric and polarimetric observations of the blazar OJ 287 gathered during 2016/17. The high level of activity, noticed after the General Relativity Centenary flare, is argued to be part of the follow-up flares that exhibited high levels of polarization and originated in the primary black hole jet. We propose that the follow-up flares were induced as a result of accretion disk perturbations, travelling from the site of impact towards the primary SMBH. The timings inferred from our observations allowed us to estimate the propagation speed of these perturbations. Additionally, we make predictions for the future brightness of OJ 287.
- Published
- 2017
- Full Text
- View/download PDF
23. Comparative Survival Function in Patients with Positive Surgical Margins Following Laryngectomy
- Author
-
Özkul, Yılmaz, Ciğer, Ejder, Balcı, Mustafa Koray, Kılavuz, Ahmet Erdem, Bayrak, Feda, Songu, Murat, and İşlek, Akif
- Published
- 2023
- Full Text
- View/download PDF
24. Design of collectors in centrifugal spinning: Effect on the fiber yield and morphology.
- Author
-
Naseri Joda, Nasrollah, Ince, Ahmet Erdem, Rihova, Martina, Pavlinak, David, and Macak, Jan M
- Subjects
AQUEOUS solutions ,AIR flow ,FIBERS ,POLYMERS ,MORPHOLOGY - Abstract
Centrifugal spinning is an increasingly popular and viable method to produce fibers of different compositions. However, there are still aspects to investigate and improve in the centrifugal spinning process, such as optimizing the fiber yield and obtaining defect-free fiber morphology. To address this gap, the effects of the collectors on the fiber yield and their morphology were investigated in this work. An aqueous solution with 18 wt% of PVP and two needles (18G and 21G) with different diameters and three different spinning speeds (5000, 7000, and 9000 RPM) were used to explore a set of fiber collectors with various collector spacing (1, 3, 6, 12, and 18 cm distance between the collectors' bars). The results of the experiments showed that fiber collectors affect the yield of the process and the fiber morphology to some (non-negligible) extent. Denser collectors enabled higher yield, thus reducing the waste, and positively affecting the beading of fibers. The knowledge obtained in this work about the influence of collectors on the centrifugal processing of basic polymers can be with an advantage applied to the processing of different polymers and needles used within the centrifugal spinning process. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
25. Effects of Lead on Reproduction Physiology and Liver and Gonad Histology of Male Cyprinus carpio
- Author
-
Korkmaz, Cengiz, Ay, Özcan, Dönmez, Ahmet Erdem, Demirbağ, Burcu, and Erdem, Cahit
- Published
- 2022
- Full Text
- View/download PDF
26. Effects of High Hydrostatic Pressure (HHP) Processing and Temperature on Physicochemical Characterization of Insect Oils Extracted from Acheta domesticus (House Cricket) and Tenebrio molitor (Yellow Mealworm)
- Author
-
Ugur, Ahmet Erdem, Bolat, Berkay, Oztop, Mecit Halil, and Alpas, Hami
- Published
- 2021
- Full Text
- View/download PDF
27. Effects of High Hydrostatic Pressure assisted degreasing on the technological properties of insect powders obtained from Acheta domesticus &Tenebrio molitor
- Author
-
Bolat, Berkay, Ugur, Ahmet Erdem, Oztop, Mecit Halil, and Alpas, Hami
- Published
- 2021
- Full Text
- View/download PDF
28. Influence of Lead on Reproductive Physiology and Gonad and Liver Histology of Female Cyprinus carpio
- Author
-
Korkmaz, Cengiz, Ay, Özcan, Dönmez, Ahmet Erdem, Demirbağ, Burcu, and Erdem, Cahit
- Published
- 2020
- Full Text
- View/download PDF
29. Paraziter Balık Zoonozları.
- Author
-
Dönmez, Ahmet Erdem
- Abstract
Zoonotic diseases are defined as diseases transmitted from animals to humans. These diseases are caused by bacterial, viral, fungal, and parasitic agents and generally are transmitted from vertebrate animals to humans. It is reported that more than half of the diseases seen in humans today are zoonotic infections. Therefore these diseases cause a large number of human lives to be lost and large economic losses. Among the zoonotic diseases, those originating from fish and shellfish are considered to be an important public health problem in both developed and developing countries around the world, as they put a large number of people at risk. The demand for seafood has started to increase due to the fact that red meat consumption is associated with potential disease conditions such as cancer and cardiovascular diseases, and the increase in the world population. As a result of these situations, the aquaculture sector has grown continuously in both production and consumption. However, especially in recent years, the steady increase in global consumption of fishery products, including foods containing raw or undercooked fish, causes an increase in the risks of parasitic zoonotic diseases originating from fisheries among these zoonoses. To date, many species of parasites have been reported in humans, including aquaculture associated with protozoon, trematoda, nematode and cestode. Due to global climate change, the species diversity is expected to increase even more. It has also been determined that among these parasites, Giardia, Toxoplasma, Clinostomum and Anisakis have a global distribution. Since the importance of parasitic diseases in terms of public health is underestimated compared to other disease agents, the knowledge about biology of the parasitic zoonoses agents originating from fisheries, their transmission routes, the diseases they cause and how they can be controlled is insufficient. This review aims to provide a general overview of parasitic fish zoonoses. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
30. Addressing the Modern Regimes of Urban Spectacle: Revisiting the Ottoman General Exhibition of 1863 in Istanbul.
- Author
-
Tozoglu, Ahmet Erdem
- Subjects
- *
OTTOMAN Empire , *URBAN history , *EXHIBITIONS , *EXHIBITION buildings , *MODERNITY , *ETIQUETTE , *FESTIVALS - Abstract
One of the most spectacular events of the Ottoman experience of modernity was the inauguration of the Ottoman General Exposition in Istanbul in 1863. The ancient Hippodrome, which is one of the most prominent venues of the city and the setting of memorable celebrations and festivals for centuries, hosted the event and provided the visitors with the opportunity to become part of the modern regimes of gaze and spectacle. This article posits three observer roles to reveal the multilayered structure of urban spectacle in mid-century Istanbul, namely the sultanic gaze, spectacle of the ordinary citizens, and the mediated experience of the foreigner. To understand the particularities of each position, I utilize several visual and textual documents about the exhibition event. Though just a single case in Ottoman urban history, the exposition enables us to understand how the new manner of modern urban spectacle emerged during a spectacular public event in Istanbul. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
31. Superficial Parotidectomy Versus Partial Superficial Parotidectomy: A Comparison of Complication Rates, Operative Time, and Hospital Stay
- Author
-
Kilavuz, Ahmet Erdem, Songu, Murat, Pinar, Ercan, Ozkul, Yilmaz, Ozturkcan, Sedat, and Aladag, Ibrahim
- Published
- 2018
- Full Text
- View/download PDF
32. Endoscopic Repair of Nasal Septal Perforations With Fascia Lata
- Author
-
Ozdilek, Alper, Kilavuz, Ahmet Erdem, and Serin, Gediz Murat
- Published
- 2020
- Full Text
- View/download PDF
33. Textual manifestations of Ottoman architectural revival and the search for a national idiom in the late Ottoman period
- Author
-
Ahmet Erdem Tozoglu
- Subjects
Cultural Studies ,Economics and Econometrics ,History ,Sociology and Political Science - Abstract
This article applies a critical approach to rethinking the relationship between nationalism and Ottoman architectural historiography by examining the intellectual medium during the late Ottoman period. More precisely, it examines how the history and theory of Ottoman architecture were initially established by Tanzimat (Reform) intelligentsia with the publication of Usûl-i Mimâri-i Osmani (Fundamentals of Ottoman Architecture) (1873). It addresses how the text was later comprehended and criticized by their successors, who utilized it to constitute their own vision of Turkish national architecture. By detailing the rise of the Turkish nationalist movement and the transition from Ottomanism to Turkism as the dominant identity, this article highlights the demand for the materialization of a national architecture as a component of the cultural construction of a national architectural style and the role of new public buildings as the site of nationalizing endeavors at the beginning of the twentieth century. Finally, this article problematizes the extent to which these new constructions can be deemed “national” by investigating the works of a pioneer figure of architecture, Kemaleddin Bey’s writings and the design and construction of his dormitory building, the Fifth Vakıf Han, in Istanbul.
- Published
- 2022
- Full Text
- View/download PDF
34. Yaşam Doyumu ile Romantik İlişki Doyumu Arasındaki İlişkinin İncelenmesi: Bir Z Kuşağı Çalışması
- Author
-
İrfan Kaplan and Dr. Öğr. Üyesi Ahmet ERDEM
- Subjects
education - Abstract
The aim of this study is examine the relationship between life satisfaction and romantic relationship satisfaction of university students in the z generation. In addition, the study whether the life satisfaction of generation z university students and their romantic relationship satisfaction differed according to some demographic variables, and the level of predicting the life satisfaction of generation z romantic relationship satisfaction levels was also examined. In this study, relational screening model was used. The study group of the research consisted of 171 volunteer university students, 117 male and 54 female, who were accepted as the z generation and were studying at the university in the 2021-2022 academic year. The research data were collected with the ”Relationship Satisfaction Scale“ and ”Life Satisfaction Scale". The data regarding the scales applied to the participants participating in the research were analyzed with the SPSS (Statistical Package for Social Sciences) 26 package. As a result of the analysis, while the romantic relationship satisfaction level of the Z generation university students did not differ according to gender; It was concluded that life satisfaction levels differed according to gender. Accordingly, the life satisfaction of female students in generation z is higher than that of male students. In addition, while the life satisfaction levels of the z generation university students do not differ according to whether they are in a romantic relationship or not; It was concluded that the level of romantic relationship satisfaction differed. Accordingly, the level of relationship satisfaction of the generation z university students who are in a romantic relationship is higher than the students who are not in a romantic relationship. In addition, it was concluded in the study that there was no significant relationship between the life satisfaction of the z generation and their relationship satisfaction, and that the romantic relationship satisfaction levels of the z generation did not predict their life satisfaction. Keywords: Generation Z, üniversity students, life satisfaction, romantic relationship satisfaction, demographic variable.
- Published
- 2022
- Full Text
- View/download PDF
35. Preeclampsia development and neonatal outcomes in pregnant women who were anemic in the first trimester
- Author
-
Münire Funda Cevher Akdulum, Seçil İrem Arık Alpçetin, Erhan Demirdağ, Mehmet Erdem, and Ahmet Erdem
- Abstract
Background/Aim: Anemia is a disease that can be easily treated, but it is still widespread worldwide. Anemia can affect nearly 40% of women. Anemia has been extensively studied and related to a variety of pregnancy complications. The primary purpose of our study was to discover the relationship between preeclampsia and anemia in the first trimester, and the secondary goal was to analyze the outcomes of newborns born to these mothers. Methods: This study was compiled as a retrospective cohort study. Age, gravida, parity, and thyroid stimulating hormone (TSH) levels were recorded in a patient’s first visit file. Hemoglobin counts in the first trimester were analyzed as hemogram values. Those with a hemoglobin value 0.05). Preeclampsia frequency was statistically higher in pregnant women who were anemic in the first trimester (P = 0.032). Conclusion: Preeclampsia was found to be more common in pregnant women who were anemic in the first trimester. Although it would seem that neonatal outcomes are unaffected, we believe that the unaffected outcomes are due to iron replacement. To avoid pregnancy complications, it is crucial for women not to be anemic prior to becoming pregnant.
- Published
- 2022
- Full Text
- View/download PDF
36. Incremental closeness centrality in distributed memory
- Author
-
Sarıyüce, Ahmet Erdem, Saule, Erik, Kaya, Kamer, and Çatalyürek, Ümit V.
- Published
- 2015
- Full Text
- View/download PDF
37. Akrabalık Kavramları Bağlamında Özbek Atasözleri Üzerine Bir İnceleme
- Author
-
Ahmet ERDEM
- Published
- 2022
- Full Text
- View/download PDF
38. Su Ürünleri Aşılarında Nanoparçacıklar
- Author
-
Ahmet Erdem DÖNMEZ
- Abstract
Nanoteknoloji, atomların ve moleküllerin en küçük ölçeklerde ortaya çıkarılması ve uygulanması teknolojisine verilen isim olup genel olarak 1-100 nanometre (nm) arası boyutlara sahip malzeme veya cihazların geliştirilmesi veya değiştirilmesi çalışmalarını kapsamaktadır. Nanoteknolojinin tıbbi alandaki uygulamalarının gelişmesi sonrasında farklı şekillerde kullanılabilecek ilaç ve ilaç taşıyıcı nanoparçacıkları üretmek de mümkün hale gelmiştir. Su ürünleri yetiştiriciliğinde nanoteknolojinin su arıtımı, hastalıklarının tespiti ile kontrolü, besinlerin ve ilaçların verimli bir şekilde uygulanabilmesi ile hızlı hastalık tanısı, doğrudan hedefe yönelik ilaç ve aşı uygulamalarında da kullanılması söz konusudur. Biyoteknoloji ile yakın ilişkisi olan nanoteknoloji günümüzde büyük ilerleme kaydetmiş ve aşılama alanındaki uygulaması genişleyerek nanovaksinoloji adı verilen yeni bir bilim alanının oluşumunu sağlamıştır. Nanobiyoteknolojinin, geleneksel aşılama uygulamaları sonrasında organizmada oluşabilecek biyolojik, biyofiziksel ve biyomedikal sorunların üstesinden gelebilecek yeni nesil ve daha etkili aşıların geliştirilmesine olanak sağladığı düşünülmektedir. Bu derlemede ana hatlarıyla nanomalzemeler ve nanoteknolojinin su ürünleri alanında aşı uygulamalarındaki kullanımının açıklanması amaçlanmıştır
- Published
- 2023
- Full Text
- View/download PDF
39. First photometric study of three eclipsing binary star systems: V495 Aur, V589 Aur and V478 Cam
- Author
-
Oğuz Öztürk and Ahmet Erdem
- Subjects
Space and Planetary Science ,Astronomy and Astrophysics ,Instrumentation - Published
- 2023
- Full Text
- View/download PDF
40. SONIC: streaming overlapping community detection
- Author
-
Sarıyüce, Ahmet Erdem, Gedik, Buğra, Jacques-Silva, Gabriela, Wu, Kun-Lung, and Çatalyürek, Ümit V.
- Published
- 2016
- Full Text
- View/download PDF
41. Incremental k-core decomposition: algorithms and evaluation
- Author
-
Sarıyüce, Ahmet Erdem, Gedik, Buğra, Jacques-Silva, Gabriela, Wu, Kun-Lung, and Çatalyürek, Ümit V.
- Published
- 2016
- Full Text
- View/download PDF
42. Comparison of Absorbable and Nonabsorbable Sutures in Columellar Incision Closure in Rhinoplasty and Their Effects to Postoperative Scar
- Author
-
Kilavuz, Ahmet Erdem, Bayram, Ali Alper, and Serin, Gediz Murat
- Published
- 2017
- Full Text
- View/download PDF
43. Geliştirilmiş Kızıl Tilki Optimizasyon Algoritması ile Da-Da Alçaltıcı Tip Dönüştürücü PI Katsayılarının Optimizasyonu.
- Author
-
Yaylacı, Ersagun Kürşat, Özdeş, Hatice Nur, and Yılmaz, Ahmet Erdem
- Subjects
OPTIMIZATION algorithms ,PARTICLE swarm optimization ,VOLTAGE control ,ABSOLUTE value ,INFORMATION storage & retrieval systems - Abstract
Copyright of Karaelmas Science & Engineering Journal / Karaelmas Fen ve Mühendislik Dergisi is the property of Karaelmas Science & Engineering Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
44. Preparation of hydrophobic macroinimer–based novel hybrid sorbents for efficient removal of organic liquids from wastewater
- Author
-
Ahmet Erdem, Nigar Mammadli, and Ufuk Yildiz
- Subjects
chemistry.chemical_classification ,Chemistry ,Health, Toxicology and Mutagenesis ,Butyl acrylate ,General Medicine ,Wastewater ,010501 environmental sciences ,01 natural sciences ,Pollution ,Solvent ,Methacryloyl chloride ,chemistry.chemical_compound ,Chemical engineering ,Spectroscopy, Fourier Transform Infrared ,Acetone ,Environmental Chemistry ,Ethyl acrylate ,Petroleum Pollution ,Adsorption ,Prospective Studies ,Methyl acrylate ,Alkyl ,0105 earth and related environmental sciences ,Dichloromethane - Abstract
Herein, the synthesis of hydrophobic macroinimer–based hybrid sorbents and their use in the removal of organic solvents from wastewater is explored. Polydimethylsiloxane (PDMS), 4,-4′-azobis-4-cyanopentanoyl chloride (ACPC), and methacryloyl chloride were reacted via bulk condensation polymerization to synthesize the macroinimer. The organogel systems were then prepared with macroinimer using different acrylic monomers of methyl acrylate, ethyl acrylate, and butyl acrylate without any additional crosslinker and initiator. The structural properties of the obtained final products were characterized by FT-IR, 1H-NMR, and TGA. The effect of alkyl chain length and macroinimer moieties in the organogel networks, as well as the swelling capacities of the prepared gels, was evaluated for different organic solvents and oils. The maximum solvent absorbencies of macroinimer-based organogels were determined as 85.3%, 100.9%, 1422.1%, 1660.0%, 3809.3%, and 5032.2% for diesel oil, gasoline, acetone, benzene, tetrahydrofuran (THF), and dichloromethane (DCM), respectively. Furthermore, adsorption-desorption kinetics, selective absorption from oil/water mixtures, temperature effect on the absorption capacity, and reusability tests were investigated. Obtained results showed that the prepared organogels possessed high swelling, efficient absorption capacity, and good oil separation performance in the removal of organic solvents from wastewater. The temperature-dependent absorption study shows no significant change in absorption capacity. Thus, the prepared macroinimer-based organogels in the present study demonstrate potential as prospective sorbents for organic pollutant cleanup from wastewater.
- Published
- 2021
- Full Text
- View/download PDF
45. Endoscopic Repair of Nasal Septal Perforations With Fascia Lata
- Author
-
Ahmet Erdem Kilavuz, Alper Ozdilek, and Gediz Murat Serin
- Subjects
Adult ,Male ,Novel technique ,medicine.medical_specialty ,medicine.medical_treatment ,Perforation (oil well) ,Surgical Flaps ,Young Adult ,03 medical and health sciences ,Tympanoplasty ,0302 clinical medicine ,Fascia lata ,Fascia Lata ,Nasal septum ,Humans ,Medicine ,In patient ,030223 otorhinolaryngology ,Retrospective Studies ,Nasal Septal Perforation ,Surgical approach ,business.industry ,Endoscopy ,030206 dentistry ,General Medicine ,Middle Aged ,Rhinoplasty ,Surgery ,body regions ,medicine.anatomical_structure ,Otorhinolaryngology ,Female ,business - Abstract
PURPOSE Nasal septal perforation (NSP) consists of defects of mucosa, cartilage, and bone. Nasal septal surgery is by far the most common cause of NSP. Many surgical approaches have been described for NSP repair. In this study, the authors describe a novel technique for repairing all sizes of NSP using an only fascia lata graft. METHODS The authors implemented a retrospective study design. Seventeen patients who underwent NSP repair between January 2016 and January 2019 were included to the study. Entire nasal surgical steps were performed under endoscopic view, harvested fascia lata graft is placed in tympanoplasty fashion after all edges of perforation is elevated and implantation bed is prepared. RESULTS The mean size of the septal peforations were 18.52 ± 4.17 mm horizontally, 11.52 ± 3.42 mm vertically. The mean follow up period was 14.47 ± 9.5 months (range: 2-36). In 15 of the 17 patients, total NSP closure was achieved (88,23%). CONCLUSIONS Endoscopic close technique using fascia lata for nasal septal perforation closure is a safe and reliable technique with high success rate and it should be considered in patients with nasal septal perforation.
- Published
- 2020
- Full Text
- View/download PDF
46. The impact of granulocyte colony-stimulating factor (G-CSF) on thin endometrium of an animal model with rats
- Author
-
Ahmet Erdem, Ismail Guler, S Saribas, Mesut Oktem, Mehmet Erdem, G Isik, Candan Ozogul, Emel Ozalp Oktem, Tıp Fakültesi, and Gülistan Sanem Sarıbaş / 0000-0001-7582-6235
- Subjects
Uterine Diseases ,Endocrinology, Diabetes and Metabolism ,Rat model ,Drug Evaluation, Preclinical ,Obstetrics and Gynecology ,GCSF ,Biology ,Endometrium ,Granulocyte colony-stimulating factor ,Rats, Sprague-Dawley ,Andrology ,Disease Models, Animal ,Endocrinology ,Animal model ,medicine.anatomical_structure ,IVF ,Apoptosis ,Thin endometrium ,medicine ,Animals ,Female ,Embryo Implantation ,granulocyte colony-stimulating factor ,recurrent implantation failure - Abstract
Purpose: To evaluate whether G-CSF improves the endometrial thickness of thin endometrium by influencing proliferative, angiogenic and apoptotic factors, an experimental rat model was conducted using 24 female adult rats with either thin or healthy endometrium that each was further divided into G-CSF or saline injection groups with six rats. Materials and methods: After forming of the thin endometrium by uterine injection of 0.2 ml 96% ethyl alcohol to the rats, five days of subcutaneous injections of 40 μg/kg G-CSF or saline were given. Endometrial thickness, immunohistochemically expression of vascular endothelial growth factor receptor-2 (VEGF-R2), proliferative cell nuclear antigen (PCNA) and fibronectin apoptosis with TUNEL method were compared in specimens among four groups of post-model rats. Results: Endometrial thickness was significantly improved in thin but not in normal endometrium group with GCSF when compared to saline injection. Stromal and glandular epithelial expression of PCNA and pericapillary VEGF-R2 was significantly increased, and apoptosis was significantly decreased with G-CSF. Although fibronectin was also increased with G-CSF in the thin endometrium, the difference was non-significant. In further, G-CSF decreased apoptotic cells and increased expression of PCNA when compared to saline injection in normal endometrium. Conclusions: G-CSF improves endometrial thickness, proliferation, angiogenesis and DNA fragmentation in thin endometrium. © 2020 Informa UK Limited, trading as Taylor & Francis Group.
- Published
- 2020
- Full Text
- View/download PDF
47. Absolute parameters of three southern eclipsing binaries: DQ Car, BK Ind, and V4396 Sgr
- Author
-
Fred Marang, D. Sürgit, Ahmet Erdem, and C. A. Engelbrecht
- Subjects
Physics ,Absolute (philosophy) ,010308 nuclear & particles physics ,Space and Planetary Science ,0103 physical sciences ,Astronomy and Astrophysics ,Astrophysics ,010303 astronomy & astrophysics ,01 natural sciences - Abstract
We present combined photometric and spectroscopic analyses of the three southern eclipsing binary stars: DQ Car, BK Ind, and V4396 Sgr. Radial velocity curves of these three systems were obtained at the South African Astronomical Observatory, and their light curves from the available data bases and surveys were used for the analysis. 75 new times of minima for these three eclipsing binaries were derived, and their ephemerides were updated. Only the O–C diagram of DQ Car indicates a cyclical variation, which was interpreted in terms of the light-time effect due to a third body in the system. Our final models describe these three systems as Algol-like binary stars with detached configurations. The masses and radii were found to be M1 = 1.86(±0.17) M⊙, R1 = 1.63(±0.06) R⊙ and M2 = 1.74(±0.17) M⊙, R2 = 1.52(±0.07) R⊙ for the primary and secondary components of DQ Car; M1 = 1.16(±0.05) M⊙, R1 = 1.33(±0.03) R⊙ and M2 = 0.98(±0.04) M⊙, R2 = 1.00(±0.03) R⊙ for BK Ind; and M1 = 3.14(±0.22) M⊙, R1 = 3.00(±0.09) R⊙ and M2 = 3.13(±0.24) M⊙, R2 = 2.40(±0.08) R⊙ for V4396 Sgr, respectively. The distances to DQ Car, BK Ind, and V4396 Sgr were derived to be 701(±50), 285(±20), and 414(±30) pc from the distance modulus formula, taking into account interstellar extinction. The evolutionary status of these three systems was also studied. It has been found that the components of DQ Car are very young stars at the age of ∼25 Myr and those of BK Ind and V4396 Sgr are evolved main-sequence stars at the ages of ∼2.69 Gyr and ∼204 Myr, respectively.
- Published
- 2020
- Full Text
- View/download PDF
48. Comparison of natural and artificial cycles in frozen-thawed embryo transfer: A retrospective analysis of 1696 cycles
- Author
-
Erhan Demirdağ, İsmail Güler, Münire Funda Cevher Akdulum, Esin Şahin, Ayşe Duygu Tufan, Ahmet Erdem, and Mehmet Erdem
- Subjects
Obstetrics and Gynecology - Abstract
Objective: This study aimed to compare the pregnancy outcomes of natural cycles (NC) and artificial cycles (AC) in patients undergoing endometrial preparation for frozen-thawed embryo transfer (FET). Materials and Methods: This retrospective cohort study was conducted in a private infertility clinic between September 2016 and January 2021 and reviewed 1696 FET cycles. Among these FET cycles, endometrial preparation protocols that are performed as the NC (group 1) and AC (group 2) were analyzed. Outcome measures were live birth rates (LBR), clinical pregnancy rates (CPR), implantation rates (IR), and miscarriage rates (MR). Results: The mean serum estradiol level before progesterone supplementation was significantly higher in group 2, whereas endometrial thickness before progesterone supplementation was higher in group 1 (p 0.05). The mean number of transferred embryos and embryo quality score rates regarding cleavage and blastocyst stages were similar in both groups. The IR and MR were similar between groups (p 0.05). Additionally, CPR and LBR were similar in groups 1 (39.2% and 32.8%) and 2 (37.3% and 28.5%) (p=0.517, p=0.134, respectively). Multivariate logistic regression analyses revealed that female age at embryo freezing time and the number of transferred embryos were predictable variables of live birth [odds ratio (OR): 0.970, confidence interval (CI): 0.948-0.991, p
- Published
- 2022
49. Effects of antenna position on readability of RFID tags in a refrigerated sea container of frozen bread at 433 and 915 MHz
- Author
-
Laniel, Magalie, Émond, Jean-Pierre, and Altunbas, Ahmet Erdem
- Published
- 2011
- Full Text
- View/download PDF
50. The relationship between thyroid autoimmunity and poor response to ovarian stimulation in in vitro fertilization women with infertility
- Author
-
Münire Funda Cevher Akdulum, Mehmet Erdem, Gunel Barut, Erhan Demirdag, Özlem Turhan İyidir, Ismail Guler, and Ahmet Erdem
- Subjects
Male ,Endocrinology ,Ovulation Induction ,Pregnancy ,Semen ,Endocrinology, Diabetes and Metabolism ,Infertility ,Humans ,Autoimmunity ,Female ,Fertilization in Vitro ,Retrospective Studies - Abstract
Thyroid autoimmunity (TAI) is the most common autoimmune disorder. Patients with TAI are usually euthyroid, and the presence of anti-thyroid peroxidase (anti-TPO) in patients with or without thyroid dysfunction is associated with infertility, recurrent embryo implantation failure, and early pregnancy loss. We aimed to investigate the relationship between low ovarian reserve, pregnancy outcomes, and TAI.This retrospective cohort study was conducted in in vitro fertilization/intracytoplasmic sperm injection (IVF/ICSI) patients between 2010 and 2018. All patients (n = 1400) for whom thyroid autoantibody testing was requested were detected. A study group was formed from patients with anti-TPO positivity (n = 363). The control group (n = 555) comprised euthyroid anti-TPO negative patients matched to the study group regarding age and body mass index (BMI).Mean serum TSH value was 2.35 ± 1.70 mIU/mL in anti-TPO-positive patients and 1.81 ± 1.2 mIU/mL in controls, and the difference was significant (p0.05). Total dose of gonadotropins used in ovulation induction in anti-TPO-positive and control patients were 3000 IU and 2700 IU, respectively, and the difference was statistically significant (p0.05). The number of metaphase 2 oocytes was significantly lower in the anti-TPO-positive group (p0.05). Embryo transfer number and embryo grade were significantly lower in the anti-TPO-positive group (p0.01). Poor ovarian response was significantly higher in anti-TPO-positive patients (40%) as compared to anti-TPO-negative controls (30%) (p0.01). Clinical pregnancy rate was significantly lower in the anti-TPO-positive group (29.2%), as compared to the antibody-negative group (38.4%) (p0.01).There are controversial data regarding the impact of antithyroid antibodies on ovarian reserve and pregnancy outcome after IVF treatment. The results of this study indicate that there was a relationship between TAI and poor ovarian response, and that TAI adversely affects IVF outcomes. Further investigations are required to explore the mechanism behind these effects.
- Published
- 2022
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.